EP1553753B1 - Impression en couleurs - Google Patents

Impression en couleurs Download PDF

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Publication number
EP1553753B1
EP1553753B1 EP05250105.3A EP05250105A EP1553753B1 EP 1553753 B1 EP1553753 B1 EP 1553753B1 EP 05250105 A EP05250105 A EP 05250105A EP 1553753 B1 EP1553753 B1 EP 1553753B1
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EP
European Patent Office
Prior art keywords
black
dots
black dots
subset
dot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05250105.3A
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German (de)
English (en)
Other versions
EP1553753A2 (fr
EP1553753A3 (fr
Inventor
Meng Yao
Mark R. Parker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
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Xerox Corp
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Publication date
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Publication of EP1553753A2 publication Critical patent/EP1553753A2/fr
Publication of EP1553753A3 publication Critical patent/EP1553753A3/fr
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Publication of EP1553753B1 publication Critical patent/EP1553753B1/fr
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/52—Circuits or arrangements for halftone screening

Definitions

  • the subject disclosure is generally directed to reducing artifacts in color printing.
  • Color printers typically employ a plurality of inks of different primary colors to generate a spectrum of colors. For example, many color printers use four ink colors: cyan (C), magenta (M), yellow (Y) and black (K). Color images are formed on a receiving substrate or medium by placing combinations of zero or more dots of C, M, Y or K ink at each pixel location. However, since dot placement can be less than ideal, various artifacts such as banding can occur.
  • EP0665674A2 discloses a color printing system wherein image data is first converted into a Hue-Plus-Grey (HPG) color space before a half-tone or dithering process is applied.
  • the conversion process may involve replacing a black color with certain levels of cyan (C), magenta (M), yellow (Y) and black (K).
  • C cyan
  • M magenta
  • Y yellow
  • K black
  • the result of the half-tone or dithering process is a Red, Green, Blue (RGB) value.
  • EP0583127A2 discloses a color spatial filter for thermal inkjet printers. This color filter alters and corrects black pixel coloring dependent on the spatial location of the black pixel. However, this filter is not designed to operate with half-toned images.
  • EP1429200A2 was filed before the priority date of the present application but was published after this date. Hence, its teachings, related to the selective enhancement of black in printing, are only relevant to the novelty of the present application.
  • a method of printing comprising:
  • the invention leads to a more uniform distribution of black dots.
  • FIG. 1 is a schematic block diagram of an embodiment of a printing apparatus that includes an interface 31 that receives print data, for example from a host computer, and stores the print data in a buffer memory 33.
  • a processor 35 is configured to process the print data to produce bit mapped raster data that is stored in a memory 37.
  • a print engine 39 prints an image pursuant to the bit mapped raster data generated by the processor 35.
  • the print engine 39 can be an electrophotographic print engine or an ink jet print engine, for example.
  • Printing is accomplished by selectively printing, depositing, applying or otherwise forming markings such as dots on a receiver surface or substrate that can be a print output medium such as paper or a transfer surface such as a transfer belt or drum. If a transfer surface is used, the image formed or printed on the transfer surface is appropriately transferred to a print output medium such as paper.
  • FIG. 2 is a schematic illustration of an embodiment of an array 20 of pixel locations P that can be used to define the locations on a print output medium 41 that can be marked or printed.
  • a marking of a particular primary color e.g., cyan magenta, yellow or black
  • a dot e.g., cyan magenta, yellow or black
  • Each pixel location P can, for example, be marked or printed with (a) one or more non-black color dots (e.g., cyan, magenta or yellow), (b) a black dot by itself, or (c) a black dot and at least one non-black color dot.
  • non-black color dots e.g., cyan, magenta or yellow
  • Print data typically comprises continuous tone data (such as 32-bit or 24-bit pixel data), and halftoning (e.g., using one or more halftone threshold arrays) is commonly employed to map or transform continuous tone data to a halftoned bit map that contains one bit per pixel per primary color plane, for example.
  • halftoning e.g., using one or more halftone threshold arrays
  • a process black dot comprises for example a combination of a cyan dot, a magenta dot and a yellow dot.
  • a combination of a black dot and at least one non-black dot can be conveniently called a black plus non-black dot, and can comprise for example a black dot and a single non-black dot, or a black dot and a plurality of non-black dots. In this manner, some black dots are replaced with process black dots, while other black dots are replaced with black plus non-black dots.
  • FIG. 3 is a schematic flow diagram of an embodiment of a procedure for printing black pixels.
  • each of the black dots of a first subset of the black dots of a bit map for a predetermined area is replaced with a process black dot.
  • a non-black dot is added to each of the black dots of a second subset of the black dots of the bit map for the predetermined area.
  • the bit map is printed.
  • the black dots of the first subset can comprise a percentage of all the black dots that tends to generally decrease as the ratio of black coverage to total coverage in the predetermined area increases.
  • the black dots of the second subset can comprise a percentage of all the black dots that tends to generally increase as the ratio of black coverage to total coverage in the predetermined area increases.
  • the first and second subsets can be mutually exclusive so as to be non-overlapping.
  • each subset comprises black dots that are not in the other subset.
  • the combination of the first and second subsets can comprise all or less than all of the black dots, whereby some of the black dots are not replaced with black dots and do not have a non-black dot added thereto.
  • the black dots that are replaced with process black dots can be generally uniformly distributed.
  • the black dots to which a non-black dot is added can be uniformly distributed.
  • a stochastic halftone threshold array or screen can be conveniently employed.
  • determining whether a black dot is replaced with a process black dot or has a non-black dot added to it can be accomplished by halftoning continuous tone print data wherein each of the black values in the corresponding continuous tone data has been replaced with (a) a black plus non-black value kcmy that has been determined as a function of the relative amount or coverage of black in the continuous tone data, e.g., the ratio of black coverage to total color coverage, and (b) a process black value cmy that comprises the difference between the black value and the black plus non-black value.
  • BK_REL bk / TOTAL
  • the black plus non-black value can increase as the relative amount of black BK_SCALED increases.
  • the black plus non-black value kcmy can be a linear function of the relative amount of black, or kcmy can be sigmoid function of the relative amount of black.
  • the modified continuous tone data is halftoned, for example to distribute the replacement process black dots and the black dots to which a non-black dot has been added.
  • the replacement process black dots can be printed at pixel locations having associated threshold values in the range of 0 to cmy-1, and the black dots and additional non-black dots can be printed at pixel locations having associated threshold values in the range of cmy to cmy+kcmy-1, for example.
  • the black dots to which a particular non-black color dot is added can also be generally uniformly distributed, for example by use of a stochastic halftone threshold value array.
  • the black plus non-black value kcmy generally represents the portion of black dots in the area to which non-black dots are added
  • the process black value cmy represents the portion of black dots in the area that are replaced with process black dots.
  • kcmy and cmy are scalars in the range [0, 255]
  • kcmy/255 would be the fraction of black dots to which non-black dots are added while cmy/255 would be the fraction of black dots that are replaced with process black dots.
  • FIG. 4 is a schematic flow diagram of an embodiment of a procedure for printing black pixels.
  • each of the black dots of a first subset of the black dots of a bit map for a predetermined area is replaced with a process black dot.
  • a cyan dot is added to each of the black dots of a second subset of the black dots of the bit map for the predetermined area.
  • a magenta dot is added to each of the black dots of a third subset of the black dots of the bit map for the predetermined area.
  • a yellow dot is added to each of the black dots of a fourth subset of the black dots of the bit map for the predetermined area.
  • the bit map is printed.
  • the black dots of the first subset can comprise a percentage of all the black dots that tends to generally decrease as the ratio of black coverage to total coverage in the predetermined area increases.
  • the black dots of the second through fourth subsets can comprise a percentage of all the black dots that tends to generally increase as the ratio of black coverage to total coverage in the predetermined area increases.
  • the first, second, third and fourth subsets can be mutually exclusive so as to be non-overlapping.
  • each subset comprises black dots that are not in any of the other subsets.
  • the combination of the first through fourth subsets can comprise all or less than all of the black dots, whereby some of the black dots are not replaced with black dots and do not have a non-black dot added thereto.
  • the black dots that are replaced with process black dots can be generally uniformly distributed.
  • the black dots to which cyan dots are added can be generally uniformly distributed.
  • the black dots to which magenta dots are added can be generally uniformly distributed, and the black dots to which yellow dots are added can be generally uniformly distributed.
  • determining whether a black dot is replaced with a process black dot or has a cyan, magenta or yellow dot added to it can be accomplished by halftoning continuous tone print data wherein each of the black values in the corresponding continuous tone data has been replaced with (a) a black plus cyan value kc, (b) a black plus magenta value km, (c) a black plus yellow value ky, wherein the sum of kc, km, ky has been determined as a function of the relative amount or coverage of black in the continuous tone data, e.g., the ratio of black coverage to total color coverage, and (d) a process black value cmy that comprises the difference between the black value and the sum of the black plus cyan value, the black plus magenta value, and the black plus yellow value.
  • cmy, kcmy, kc, km, ky can be expressed as percentages or scalars, depending upon implementation. For example, these values can be scaled to [0, 255] for an implementation wherein color values (e.g., bk, cm, cy, my, c, m, y) are in the range of 0 to 255.
  • color values e.g., bk, cm, cy, my, c, m, y
  • FIG. 5 schematically illustrates an embodiment of a stochastic halftone threshold value that can be employed as follows for the illustrative example wherein the color values, the values cmy, kc, km, ky and the threshold values are scaled to the same range such as [0, 255], and wherein t is the threshold value: if cmy>t C, M Y dots are on else if cmy+ck>t K, C dots are on else if cmy+ck+mk>t K, M dots are on else if cmy+ck+mk+yk>t K, Y dots are on else if cmy+ck+mk+yk+cm>t C, M dots are on else if cmy+ck+mk+yk+cm+cy>t C, Y dots are on else if cmy+ck+mk+yk+cm+cy+my>t M, Y dots are on else if cmy+ck+mk+yk+cm+my>t M,
  • replacement process black dots can be printed at pixel locations having associated threshold values in the range of 0 to cmy-1, and black dots to which cyan are added can be printed at pixel locations having associated threshold values in the range of cmy to cmy+kc-1.
  • Black dots to which magenta dots are added can be printed at pixel locations having associated threshold values in the range of cmy+kc to cmy+kc+km-1, and black dots to which yellow dots are added can be printed at pixel locations having associated threshold values in the range of cmy+kc+km to cmy+kc+km+ky-1, for example.
  • the black plus cyan value kc generally represents the portion of black dots in the area to which cyan dots are added
  • the black plus magenta value km generally represents the portion of black dots in the area to which magenta dots are added
  • the black plus yellow value ky generally represents the portion of black dots in the area to which yellow dots are added
  • the process black value cmy represents the portion of black dots in the area that are replaced with process black dots.
  • kc/255 would be the fraction of black dots to which cyan dots are added
  • km/255 would be the fraction of black dots to which magenta dots are added
  • ky/255 would be the fraction of black dots to which yellow dots are added
  • cmy/255 would be the fraction of black dots that are replaced with process black dots.
  • FIG. 6 is a schematic flow diagram of an embodiment of a procedure for printing halftoned bit map data wherein at least some of black dots have been replaced with process black or have had a non-black color added thereto, for example as described previously.
  • the procedure of FIG. 6 selectively converts process black dots (e.g., pixels that contain a cyan dot, a magenta dot and a yellow dot) and black plus non-black dots (i.e., black dots that have an added non-black color dot) to black dots, so that black regions such as black text tend to be printed with no non-black color.
  • process black dots e.g., pixels that contain a cyan dot, a magenta dot and a yellow dot
  • black plus non-black dots i.e., black dots that have an added non-black color dot
  • each process black dot (which can be combination of a cyan dot, a magenta dot and a yellow dot) and each black plus non-black dot (which can be combination of a black dot and a non-black dot) of a halftoned bit map is changed to a black dot if each of first and second adjacent dots on either side of such process black dot or black plus non-black dot along a predetermined axis (e.g., a column axis, a row axis, or a diagonal axis) comprises a black dot, a black plus non-black dot, a process black dot, or a white dot (which is the absence of both black and non-black color).
  • a predetermined axis e.g., a column axis, a row axis, or a diagonal axis
  • the bit map is printed.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color Image Communication Systems (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Ink Jet (AREA)
  • Color, Gradation (AREA)

Claims (9)

  1. Procédé d'impression comprenant le fait de :
    remplacer (111) chacun des points noirs d'un premier sous-ensemble de points noirs d'une carte binaire en demi-teinte pour une zone prédéterminée avec un point noir du traitement comprenant un ou plusieurs points de couleur non noirs ;
    ajouter (113) un point non noir à chacun des points noirs d'un deuxième sous-ensemble de points noirs d'une carte binaire en demi-teinte ; et
    imprimer (115) la carte binaire ;
    où la carte binaire en demi-teinte est générée par des données à tons continus de demi-teinte ;
    où les points noirs du deuxième sous-ensemble comprennent un pourcentage de tous les points noirs qui ont globalement tendance à augmenter à mesure qu'un rapport de couverture de noir par la somme de toutes les couvertures de couleur à tons continus dans la zone prédéterminée augmente ; et
    où le deuxième sous-ensemble comprend des points noirs qui ne sont pas dans le premier sous-ensemble.
  2. Procédé de l'une des revendications précédentes, dans lequel le premier sous-ensemble et le deuxième sous-ensemble comprennent tous les points noirs de la carte binaire en demi-teinte.
  3. Procédé de l'une des revendications précédentes, dans lequel les points noirs du premier sous-ensemble sont distribués de manière globalement uniforme.
  4. Procédé de l'une des revendications précédentes, dans lequel les points noirs du deuxième sous-ensemble sont distribués de manière globalement uniforme.
  5. Procédé selon l'une des revendications précédentes, comprenant en outre le fait de :
    ajouter (213) un point cyan à chacun des points noirs d'un deuxième sous-ensemble de points noirs de la carte binaire en demi-teinte ;
    ajouter (215) un point magenta à chacun des points noirs d'un troisième sous-ensemble de points noirs de la carte binaire en demi-teinte ;
    ajouter (217) un point jaune à chacun des points noirs d'un quatrième sous-ensemble de points noirs de la carte binaire en demi-teinte ;
    où les points noirs du deuxième sous-ensemble, du troisième sous-ensemble et du quatrième sous-ensemble comprennent un pourcentage de tous les points noirs qui ont globalement tendance à augmenter à mesure qu'un rapport de couverture de noir par la somme de toute la couverture de couleur à tons continus dans une zone prédéterminée augmente.
  6. Procédé de la revendication 5, dans lequel le premier jusqu'au quatrième sous-ensembles comprennent tous les points noirs dans la carte binaire en demi-teinte.
  7. Procédé de la revendication 5 ou 6, dans lequel les points noirs du troisième sous-ensemble sont distribués de manière globalement uniforme.
  8. Procédé de l'une des revendications 5 à 7, dans lequel les points noirs du quatrième sous-ensemble sont distribués de manière globalement uniforme.
  9. Programme informatique comprenant un moyen de code adapté pour exécuter toutes les étapes du procédé des revendications 1 à 8 lorsque ledit programme est exécuté sur un ordinateur.
EP05250105.3A 2004-01-12 2005-01-11 Impression en couleurs Not-in-force EP1553753B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US756058 2004-01-12
US10/756,058 US7048349B2 (en) 2004-01-12 2004-01-12 Color printing

Publications (3)

Publication Number Publication Date
EP1553753A2 EP1553753A2 (fr) 2005-07-13
EP1553753A3 EP1553753A3 (fr) 2006-08-23
EP1553753B1 true EP1553753B1 (fr) 2013-06-19

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EP05250105.3A Not-in-force EP1553753B1 (fr) 2004-01-12 2005-01-11 Impression en couleurs

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US (1) US7048349B2 (fr)
EP (1) EP1553753B1 (fr)
JP (1) JP2005204308A (fr)
CN (1) CN100579786C (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4475623B2 (ja) * 2002-07-31 2010-06-09 キヤノン株式会社 色処理方法および色処理装置
JP2006001053A (ja) * 2004-06-15 2006-01-05 Canon Inc インクジェット記録装置およびインクジェット記録方法
JP5146085B2 (ja) * 2008-04-30 2013-02-20 富士ゼロックス株式会社 画像処理装置およびプログラム
US8068257B2 (en) * 2009-02-23 2011-11-29 Xerox Corp. Color printing reducing artifacts and banding by rendering black dots, replacing dots with process black, and adding non-black dots for different subsets of black dots
US8437045B2 (en) * 2009-08-27 2013-05-07 Xerox Corporation Bitmapped based trapping methods, apparatus and system by modifying non-black halftone pixel bitmap plane using estimated continuous tone value
US8995021B2 (en) 2013-06-12 2015-03-31 Xerox Corporation Black trapping methods, apparatus and systems for binary images
CN105807586A (zh) * 2016-03-22 2016-07-27 张洪涛 医用胶片激光打印机

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60143343A (ja) * 1983-12-30 1985-07-29 Dainippon Screen Mfg Co Ltd 色修正方法
US5473446A (en) 1992-05-04 1995-12-05 Hewlett-Packard Company Color digital halftoning using black and secondary color replacement and color vector dithering
US5428377A (en) 1992-08-11 1995-06-27 Xerox Corporation Color spatial filtering for thermal ink jet printers
EP0700785B1 (fr) * 1994-08-19 2000-12-27 Fuji Xerox Co., Ltd. Méthode et appareil d'enregistrement à jet d'encre
US5568169A (en) * 1994-10-19 1996-10-22 Xerox Corporation Method and apparatus using two different black inks to reduce intercolor bleeding and provide high quality edge definition with thermal ink jet systems
US6449060B1 (en) 1996-07-22 2002-09-10 Canon Kabushiki Kaisha Image processing apparatus and method
JP3787393B2 (ja) * 1996-07-22 2006-06-21 キヤノン株式会社 画像処理装置及び方法
US6250733B1 (en) 1998-11-23 2001-06-26 Xerox Corporation Color printer halftoning method
US6290330B1 (en) * 1999-12-03 2001-09-18 Xerox Corporation Maintaining black edge quality in liquid ink printing
JP4218165B2 (ja) * 2000-01-19 2009-02-04 ブラザー工業株式会社 画像データ変換処理方法及び画像データ変換処理プログラムを記録した記録媒体
US6987588B2 (en) 2001-06-25 2006-01-17 Xerox Corporation Text and image quality enhancement
JP3855800B2 (ja) 2002-02-27 2006-12-13 ブラザー工業株式会社 画像処理装置および画像処理方法
US6742870B2 (en) 2002-10-25 2004-06-01 Xerox Corporation Selective enhancement of black
US7040730B2 (en) * 2004-01-12 2006-05-09 Xerox Corporation Color printing

Also Published As

Publication number Publication date
CN100579786C (zh) 2010-01-13
EP1553753A2 (fr) 2005-07-13
JP2005204308A (ja) 2005-07-28
EP1553753A3 (fr) 2006-08-23
CN1640677A (zh) 2005-07-20
US7048349B2 (en) 2006-05-23
US20050151788A1 (en) 2005-07-14

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